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Date: Thu, 01 Aug 2013 22:27:13 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Tang Chen <tangchen@...fujitsu.com> Cc: lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu, hpa@...or.com, akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de, yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com, mgorman@...e.de, minchan@...nel.org, mina86@...a86.com, gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com, prarit@...hat.com, zhangyanfei@...fujitsu.com, yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-acpi@...r.kernel.org Subject: Re: [PATCH v2 04/18] acpi: Introduce acpi_invalid_table() to check if a table is invalid. On Thursday, August 01, 2013 03:06:26 PM Tang Chen wrote: > In acpi_initrd_override(), it checks several things to ensure the > table it found is valid. In later patches, we need to do these check > somewhere else. So this patch introduces a common function > acpi_invalid_table() to do all these checks, and reuse it in different > places. The function will be used in the subsequent patches. > > Signed-off-by: Tang Chen <tangchen@...fujitsu.com> > Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> > --- > drivers/acpi/osl.c | 86 +++++++++++++++++++++++++++++++++++++--------------- > 1 files changed, 61 insertions(+), 25 deletions(-) > > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c > index 91d9f54..8df8a93 100644 > --- a/drivers/acpi/osl.c > +++ b/drivers/acpi/osl.c > @@ -572,9 +572,68 @@ static const char * const table_sigs[] = { > /* Must not increase 10 or needs code modification below */ > #define ACPI_OVERRIDE_TABLES 10 > > +/******************************************************************************* > + * > + * FUNCTION: acpi_invalid_table > + * > + * PARAMETERS: File - The initrd file > + * Path - Path to acpi overriding tables in cpio file > + * Signature - Signature of the table > + * > + * RETURN: 0 if it passes all the checks, -EINVAL if any check fails. > + * > + * DESCRIPTION: Check if an acpi table found in initrd is invalid. > + * @signature can be NULL. If it is NULL, the function will check > + * if the table signature matches any signature in table_sigs[]. > + * > + ******************************************************************************/ > +int __init acpi_invalid_table(struct cpio_data *file, > + const char *path, const char *signature) > +{ > + int idx; > + struct acpi_table_header *table = file->data; > + > + if (file->size < sizeof(struct acpi_table_header)) { > + INVALID_TABLE("Table smaller than ACPI header", > + path, file->name); > + return -EINVAL; > + } > + > + if (signature) { > + if (memcmp(table->signature, signature, 4)) { > + INVALID_TABLE("Table signature does not match", > + path, file->name); > + return -EINVAL; > + } > + } else { > + for (idx = 0; table_sigs[idx]; idx++) > + if (!memcmp(table->signature, table_sigs[idx], 4)) > + break; > + > + if (!table_sigs[idx]) { > + INVALID_TABLE("Unknown signature", path, file->name); > + return -EINVAL; > + } > + } > + > + if (file->size != table->length) { > + INVALID_TABLE("File length does not match table length", > + path, file->name); > + return -EINVAL; > + } > + > + if (acpi_table_checksum(file->data, table->length)) { > + INVALID_TABLE("Bad table checksum", > + path, file->name); > + return -EINVAL; > + } > + > + return 0; > +} > + > void __init acpi_initrd_override(void *data, size_t size) > { > - int sig, no, table_nr = 0, total_offset = 0; > + int no, table_nr = 0, total_offset = 0; > long offset = 0; > struct acpi_table_header *table; > char cpio_path[32] = "kernel/firmware/acpi/"; > @@ -593,33 +652,10 @@ void __init acpi_initrd_override(void *data, size_t size) > data += offset; > size -= offset; > > - if (file.size < sizeof(struct acpi_table_header)) { > - INVALID_TABLE("Table smaller than ACPI header", > - cpio_path, file.name); > - continue; > - } > - > table = file.data; > > - for (sig = 0; table_sigs[sig]; sig++) > - if (!memcmp(table->signature, table_sigs[sig], 4)) > - break; > - > - if (!table_sigs[sig]) { > - INVALID_TABLE("Unknown signature", > - cpio_path, file.name); > + if (acpi_invalid_table(&file, cpio_path, NULL)) > continue; > - } > - if (file.size != table->length) { > - INVALID_TABLE("File length does not match table length", > - cpio_path, file.name); > - continue; > - } > - if (acpi_table_checksum(file.data, table->length)) { > - INVALID_TABLE("Bad table checksum", > - cpio_path, file.name); > - continue; > - } > > pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", > table->signature, cpio_path, file.name, table->length); > -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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